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Traditionally, Magnum (Tom Selleck) spends the Fourth of July holiday all by himself; this year he's alone again, but not by choice, and at the worst possible time. A serial killer identified by the media as "The Ripper" has been tormenting Magnum by calling him up and reciting nursery rhymes and riddles just before each murder. As if this wasn't vexing enough, the unseen killer seems to know all about Magnum's Vietnam tour of duty--right down to the most intimate of details. "Flashbacks" taken from the Magnum, P.I pilot episode are interspersed throughout the story.